Watch the Sun Move Over Your Unit

West sun refers to a unit whose main windows face west, so it takes the full force of the afternoon and early evening sun, roughly 2pm to sunset. In Singapore's climate this can make a unit noticeably hotter in the late afternoon and push up air-conditioning costs, so it is a common thing buyers ask about before committing.

The sun position for your postal code and the direction you select is calculated using standard solar position astronomy, so the timing is accurate. I checked the output against published sunrise and sunset tables for Singapore and it matches to within a couple of minutes. What it cannot account for is shading from neighbouring buildings, trees, or the exact tilt of your unit's facade, so treat it as a solid general guide, not a guaranteed reading for your specific unit.

A postal code alone does not tell us which direction your specific unit or its windows face, that depends on the block and stack. Check your floor plan (it usually marks a compass north arrow), use a compass app while standing at your main window, or ask your agent, who can normally confirm it from the development's site plan.

Singapore sits just north of the equator, so the sun passes almost overhead but leans slightly north for part of the year and slightly south for the rest. That shift changes which windows catch the low morning and evening sun. Use the June and December buttons on the tool to see how much the path moves for your facing across the year.

Not necessarily. Nearby blocks, trees or other structures can block the sun even on a west-facing unit. This tool shows you when the sun is in a position to hit that facing, actual exposure at your specific unit can be less if something is in the way.